Fire alarm system



pril 30, 1935.

J.\C. LOWRY El' AL FIRE ALARM SYSTEM Filed July 22, 1952 l I I l @V30/f Wi@ ATTORNEY.

PatentedKpr. 30, 19435 i 'j i 'y y n y' rIklhisinvention,relates lto thermally vcontrolled yftvillfbeurrderstoo'd jthatzthehousing is prefersignal-.fapparatus and the principalleature and blyeinsertedinsairecessin the wall of the'room object rof ithe'invention resides in thecp'rovision -where'it'nisidesired :to install the device andthe of afthermallycontrolleddevicerwhich isenclosedy ,plate 5 willrcoverr the recessffand 'willtbe inconf5 ahousing having a foraminous -wallrwhereby spicuous 1 and fdecorativev in appearance.Y s arise-in temperature of the lair-adjacent the housilhe'wallA of athe ehousing :is-,formedwith a :pair ing will causefthe thermally controlled device to Sof .apertures lib/land a-wirei-II is connected to the movetocloseanaelectrical circuitthroughasignal f'postil and `extends,'through one of the apertures thereby giving Warning of a dangerous rise in'jt'while the wire l2'is yconnected tothe postf3 temperaturefofftlreYair adjacent the device. randrextendsthrcugh the-fothervaperturerIIl. The -10 Another vobject of the invention resides in ther wireszlflfand fIAi'ax-e 'connectedtosome `source foi provision of a thermally controlled Ndevice which current supply (not shown) and to the primary is connected with the circuit of a doorbell oper- Winding of the transformer I5. A wire I6 has ated by apush button and which is so connected one end connected to one terminal of the sec-r as to permit normal usage ci' thepush button ondary winding of the transformer while the op- 15 Y andwhich will close the circuit through the door posite end is connected to the terminal Il of the bell 'tokeep' the same continuously ringing when door belll IB. A wirek I 9 is connected to the oppothe temperature adjacent the thermally controlled site terminal of the secondary winding while the device rises above a predetermined point. j opposite end is connected to one terminal of the Another object of the invention resides in the usual push button'20 and the opposite end of the 2n provision of a thermally controlled device which wire I2, to that connected to the post 3, is con-y includes a bimetallic thermally controlled elenected tothe opposite terminal of the push butment having rone end connected to an electric ton 20. Wire 2| has one end connected tothe i terminal and the opposite end in spaced relation. terminal 22"*of the door bell I8 and the opposite to a 'second electric terminal and the element so end t0 the Wire I2 and the Wire ll leading from 25 arranged as to vclose the circuit through the two the pest 24 iS` Connected t0 the Wire I9.r It Will terminals when the temperature of the air adiathus be noted that by pressing the push button f cent the same has risen yabove a predetermined!!! that the. electrical circuit through the bell point. I8 will be closed and when pressure is released 'Ihese objects and the several novel features of from ythe push button the Circuit through the to the invention are hereinafter more fully described bell Will be broken lll the usual marmerand claimed andthe preferred formv o1' construc- In the event, however, that the temperature of tion by which these objects are attained is shown the air adjacent the housing 8 rises above a pre-` in the accompanying drawing in whichdetermined point then the free end of the ther- Fig1iS a diagrammatic View Showing my thermostat I will move over and contact the post 3 25 molly controlled device connected to a doorbell thereby closing the electrical circuit through the circuit. o j bell I8and causing the same to continuously ring Fig. 2 is a section through a housing having my untilthe temperature lowers sufliciently to cause improved thermally controlled device positioned the free end ofthe thermostat I to move out of 40 therein, contact with the posts 3 or until the main switch 40 Fig. Sis a similar view showinga modiiledi'orm in the bulldlng ln which the deVlCe le, installed of housingis opened. It will be understood, of course, thatV Referring to the drawing, the bimeteuie therlthcuh only 011e unit haebeen Shcwn c011- mostatic Strip l has one end connected to the nected the doorbell Circult any number post 2 While, the free end normally extends to a, of the devices may be connected in a similar manpoint in Spacedrelation to the posts The posts ner so thatV movement of any one of the thermo- 2 and 3 are mount-,edm the base Qfthe cup shaped static elements will close the circuit through the member 4 and are suitably insulated therefrom. belli It will thusk be seenythat a number of the The member 4 is secured to the plate 5 by meansy deVCeS mey be installed in a heuse 0r building of the screws 6 and by referring to Fig. 2 1t will at very little expense so that a dangerous rise in be seen that the plate is formed with the'louvres temperature 0f the air adjacent any One 0f the Y 1 so that the thermostat I is responsive to changes devices will give immediate Warning t0 that eieetin temperature ofthe air adjacent thek plate. A Referring to Fig. 3, we have shown a modified housing 8 encases the cup shaped member 4 and form of structure in whichthe flange of the cupA is secured thereto by means of the screws 9. It shaped member 4 is .secured to the housing 25 55 f preferably by spot Welding and it Will be noted that the housing 25 is formed with apertures 26 in the base and also in the periphery thereof so that the temperature of the air around the thermostat I is practically the same as that immediately outside of the housing 25.

From the foregoing description it becomes evident that we have provided a simple and inexpensive device that may be connected with a signal whereby an electric circuit through the signal will be closed when the temperature of the air adjacent the signal has risen above a predetermined point.

Having thus fully described our invention, its utility and inode or operation, what We claim and desire to secure by Letters Patent of the United States is- 1. A thermostatic switch comprising a housing adapted to be set in a Wall and having an open outer face, a cover plate detachably secured thereto having an opening and a series of spaced elements extending across the opening at an angle to the horizontal te obscure the interior of the housing from View, a thermostatic element, a support therefor attached to the cover plate to position said therniostatic element closely adjacent to the said opening in the plate, a post attached to the support to which an end of the thernicstatic element is attached, an electrical contact member carried by the support adjacent to which the opposite end 0I" the thermostatic element is positioned in normally spaced relation, the terminals of an electric circuit extending into the housing and connected respectively with said post and said contact member whereby through influence of heat the thermostatic member may be actuated to close the circuit across said post and Contact member.

2. A thermostatic switch comprising a housing having an open end and adapted for mounting in a wall opening the open end at the face of the Wall, a removable plate for covering said open end, said plate having a series of louvers providing spaced bars lying at an angle to the vertical and obscuring the interior of the device to view from the interior of a room, the louvers providing for ingress of atmosphere of the room to the interior of the housing, a pair of posts carried by the said removable plate and providing terminals of an electric circuit, said housing having openings for introduction of the circuit Wires thereinto, a bimetallic element carried by the plate and lying closely adjacent the louvers, said element being in the form of a spiral coil attached at its center to one of the posts and the free portion thereof adjacent the other whereby the expansion of the element under an increase in temperature in the air space of the device causes the same to engage sad other post and close the electric circuit.

JULIUS C. LOWRY. ORA M. RYBOLT. 

